Bridgewater 4
Total Page:16
File Type:pdf, Size:1020Kb
Visual Resource Evaluation Report Proposed Wireless Telecommunications Facility Bridgewater 4 42 and 89 Wewaka Brook Road Bridgewater, CT Prepared for Prepared by VHB/Vanasse Hangen Brustlin, Inc. 54 Tuttle Place Middletown, CT 06457 July 2010 VHB Vanasse Hangen Brustlin, Inc. Visual Resource Evaluation SBA Towers II LLC seeks approval from the Connecticut Siting Council for a Certificate of Environmental Compatibility and Public Need to construct a wireless telecommunications facility (“Facility”) to be located on property at 42 and 89 Wewaka Brook Road (“Host Property”) in the town of Bridgewater, Connecticut. This Visual Resource Evaluation was conducted to approximate the visibility of the proposed Facility within a two-mile radius of the Site (“Study Area”). Attachment A contains a map that depicts the location of the proposed Facility and the limits of the Study Area. Also contained in Attachment A is a photograph of the proposed Facility location. Project Introduction The proposed Facility includes the construction of a 170-foot tall monopole designed to support up to four antenna platforms with associated ground equipment to be located within a fenced enclosure at the base of the tower. Based on information provided by the project engineer, Clough Harbor Associates, LLP, the proposed Facility is located at approximately 582 feet above mean sea level (AMSL). Access to the proposed Facility would initially utilize an existing residential driveway off Wewaka Brook Road, but would then follow portions of an existing dirt drive and woods road currently located on the Host Property (to be improved to accommodate service vehicles) that extend to the project area in a westerly direction. Site Description and Setting The Host Property is comprised of two adjoining parcels that are identified in the Town of Bridgewater land records as Map ID 15-1 (51.2 Acres) and Map ID 15-2 (4.0 Acres). The proposed compound area and a significant portion of the proposed 12-foot wide gravel access drive would be located on parcel 15-1 which is mostly wooded and undeveloped. Parcel 15-2 is currently occupied by a single-family residence and several associated outbuildings and includes frontage along Wewaka Brook Road. Land use within the general vicinity of the proposed Facility and Host Property is mainly comprised of low-density residential development; undeveloped, forested land; and agricultural fields. In total, the Study Area contains roughly 45 linear miles of roadways. The topography within the two-mile radius surrounding the proposed Facility is characterized by both the Housatonic River/Lake Lillinonah and the Shepaug River, which flow north to south through the western and eastern portions of the Study Area, respectively and the rolling hills that generally parallel these water bodies. Ground elevations within the Study Area range from approximately 194 feet AMSL along the Housatonic River/Lake Lillinonah to approximately 860 feet AMSL on top of Botsford Hill located to the northeast of the proposed Facility. The tree cover within the Study Area consists mainly of mixed deciduous hardwood species interspersed with stands of mature evergreen species. The tree canopy occupies approximately 5,932 acres of the 8,042-acre study area (74%). During the in- J:\40999.33\reports\bridgewater_vis_report.doc 1 VHB Vanasse Hangen Brustlin, Inc. field activities associated with this analysis, an infra-red laser range finder was used to accurately determine the average tree canopy height throughout the Study Area. Numerous trees were selected for measurement and the average tree canopy established, in this case 65 feet. Lastly, the Study Area features approximately 551 acres of surface water that includes portions of the Housatonic River/Lake Lillinonah, the Shepaug River and several small ponds located to the north/northeast of the proposed Facility. METHODOLOGY In order to better represent the visibility associated with the Facility, VHB has developed a two-fold approach utilizing both a predictive computer model and in-field analysis. The predictive model is employed to assess potential visibility throughout the entire Study Area, including private property and/or otherwise inaccessible areas for field verification. A balloon float and Study Area drive-through reconnaissance are also conducted to provide a height and locational representation, back checking of the computer model and photographic documentation from publicly accessible areas. Results of the balloon float are analyzed and incorporated into the final viewshed map. A description of the methodologies used in the analysis is provided below. Visibility Analysis Using ESRI’s ArcView® Spatial Analyst, a computer modeling tool, the areas from where the top of the Facility is expected to be visible are calculated. This is based on information entered into the computer model, including Facility height, its ground elevation, the surrounding topography and existing vegetation. Data incorporated into the predictive model includes a digital elevation model (DEM) and a digital forest layer for the Study Area. The DEM was derived from the Connecticut LiDAR-based digital elevation data. The LiDAR data was produced by the University Of Connecticut Center for Land Use Education and Research (CLEAR) in 2007 and has a horizontal resolution of 10 feet. In order to create the forest layer, digital aerial photographs of the Study Area are incorporated into the computer model. The mature trees and woodland areas depicted on the aerial photos are manually traced in ArcView® GIS and then converted into a geographic data layer. The aerial photographs were produced in 2006 and have a pixel resolution of one foot. Once the data are entered, a series of constraints are applied to the computer model to achieve an estimate of where the Facility will be visible. Initially, only topography is used as a visual constraint; the tree canopy is omitted to evaluate all areas of potential visibility without any vegetative screening. Although this is an overly conservative prediction, the initial omission of this layer provides a reference for comparison once the tree canopy is established and also assists in the evaluation of potential seasonal visibility of the proposed Facility. An estimated tree canopy height of 50 feet is initially utilized to prepare a J:\40999.33\reports\bridgewater_vis_report.doc 2 VHB Vanasse Hangen Brustlin, Inc. preliminary viewshed map for use during the Study Area reconnaissance. The average height of the tree canopy, in this case 65 feet, is determined in the field using a hand-held infra-red laser range finder. The forested areas within the Study Area were then overlaid on the DEM with a height of 65 feet added and the visibility calculated. The forested areas are then extracted from the areas of visibility, with the assumption that a person standing among the trees will not be able to view the Facility beyond a distance of approximately 500 feet. Depending on the density of the vegetation in these areas, it is assumed that some locations within this range will provide visibility of at least portions of the Facility based on where one is standing. Also included on the map is a data layer, obtained from the Connecticut State Department of Environmental Protection (CTDEP), which depicts various land and water resources such as state parks and forests, recreational facilities, dedicated open space and CTDEP boat launches and other categories. This layer is useful in identifying potential visual impacts to any sensitive receptors that may be located within the Study Area. Lastly, based on a review of available data published by the Connecticut Department of Transportation and Housatonic Valley Council of Elected Officials (HVCEO), it was determined that there are currently no state- or locally-designated scenic roadways within the Study Area. The preliminary viewshed map (using topography and an initial tree canopy height of 50 feet) is used during the in-field activity to assist in determining if significant land use changes have occurred since the aerial photographs used in this analysis were produced and to compare the results of the computer model with observations of the balloon float. Information obtained during the reconnaissance is then incorporated into the final visibility map. Balloon Float and Study Area Reconnaissance On June 15, 2010 Vanasse Hangen Brustlin Inc., (VHB) conducted a balloon float at the proposed Facility location to further evaluate the potential viewshed within the Study Area. The balloon float consisted of raising and maintaining an approximate four-foot diameter, helium-filled weather balloon at the proposed site location at a height of 170 feet. Once the balloon was secured, VHB staff conducted a drive-by reconnaissance along the roads located within the Study Area with an emphasis on nearby residential areas and other potential sensitive receptors in order to evaluate the results of the preliminary viewshed map and to document where the balloon was, and was not, visible above and/or through the tree canopy. During the balloon float, the temperature was approximately 80 degrees Fahrenheit with calm wind conditions and sunny skies. J:\40999.33\reports\bridgewater_vis_report.doc 3 VHB Vanasse Hangen Brustlin, Inc. Photographic Documentation During the balloon float, VHB personnel drove the public road system to inventory those areas where the balloon was and was not visible. The balloon was photographed from several vantage points to document the actual view towards the proposed Facility. Several locations where the balloon was not visible are also included in order to provide documentation from select areas. The locations of the photos are described below: 1. View from Skyline Ridge Road. 2. View from Skyline Ridge Road adjacent to house #66. 3. View from Skyline Ridge Road adjacent to house #30. 4. View from Northrop Street adjacent to house #211. 5. View from Northrop Street. 6. View from Northrop Street adjacent to house #160. 7. View from Northrop Street adjacent to house #147. 8. View from Northrop Street adjacent to house #119.